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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '78b96c21aa0f696e7ea7ab063a34e5976942470eb7e64545cc6c1c3dd83ae649' 
  AND token = 'AFPVOIfg8yaQfk92KvZP94AgX5lYPs8KambQpzBiLds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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