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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '395462d11616a15d2551948c33f4005f040c8d6416baae30d000774e6e3e739a' 
  AND token = 'YeO0SX3PCnkXVf6gG3MTtmqQ2vq9Mw7qd7NUN9gRj8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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