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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '15659ccc7d2d8cd6ee368c61636e79b01358e90f2ccbe9f9279a877f11f21541' 
  AND token = '7ZxNLHXSu1dbMkz1h1aQTic06+eCPGGRdPdUXnsLHIA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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