SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3bbe397548bb9d405fa63b42b3da7736a9fb3d54a04bc3246218a7d26542e09d' 
  AND token = 'gtejZBLO5LkjRMM7gcJPd7JugTWR0jKsYDFchcGcBco=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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