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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd9aa85937bfd8071d711c45f6ab31d10334b95457ccb805baf8a2f4d08ef9232' 
  AND token = 'P8/SUgH4sdRzHOU34+aq6HM1sz3SlEB8F27zER0VEyM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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