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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '94861a0f12bfa00651dccb7a6432e2b15e974f4188c1c8f79c0128750e23719f' 
  AND token = 'hPlLS4be4XepJEGbzrSRpbLl6Rz5k7h/jkV8IDmTyGA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}