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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'aa0d252ae0b3f49988ece1606aedaf26ba40f176bab41e684544a80a4e9cd409' 
  AND token = 'kXCZo1hQipnk3fX0gqU/XAtM2AWi6eB9Y7HgQigatwA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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