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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c9d780149c0b63872ac9deff13d46509b33b38afc29450912e569aaf39a10fe7' 
  AND token = '07Cpi5FV1zLzjTWUPn7iZkZzn0h7Lr11+a4Tx9EaWEo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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