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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6a2947a51191d71aed0ce51f99c30137657f2623e10baafe2279c43a15b12bb4' 
  AND token = 'faaR5zXIp1KbCdqgcf6dm62Vcn0HddC185Aivqq6ns0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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