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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '06b00a49a90830537e5ec656c5be88eaad288ade176427e3231e726c4d093a24' 
  AND token = 'QetpgyL4uxiQztITIoqe2waID0Hj/gHlmoBsOI2AVWA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00066

JSON explain

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