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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dd1d90897069087b6e02d8b073cbb62d4fd44ac6c5c5941da8b5de92217347f2' 
  AND token = 'nROumle9yQ4nqKRAMX66CndYb/WqkXvUy1PjQe0yMOM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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