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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b68eeed9500125921d6db36ee8c9360485cbdb3ba475713d6e812f261f19e163' 
  AND token = 'i8/usaZP6UhHJQyPNiH3d9lsbc56Yws76P16lWQXrek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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