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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cf400a6efb99ef800b7fd0477bba022af4acf13e0dd539396eb0b0b2cbc1da3b' 
  AND token = 'pxImCS3CAH8VoHp1PTT0+StEQrj/CtfTEqY3Wq7zeao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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