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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '69569605c65d122829281a8e14e92c1bf45aa89fcd9622c53b45f630d0b6ed1c' 
  AND token = 'IWCnN0ULuA5ESkTEwTueT9NOddwLKR4K7ELUA5mu2Tg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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