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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5756054ac6aba8cabf79f40b3d2b7d93bd803bfec827d14dc6277f3a34c40c1c' 
  AND token = '9EM43/iwpP80lQenyx5pxl1+n8FiqnvXWWpvR0DYBtQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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