SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b149fc6edc6627538347ddd7f8883492fa0560a8260c0a8ee23b52cba887f903' 
  AND token = 'TNO8YVkuJxP5p08QldpGFo9ED+eVD75cOGvbmwBSAKg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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