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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '50efc538f255be8137d45f2d528ccbed504e656c960d1395f1d221cd33808297' 
  AND token = 'C7+ytRBjfe/jips31fLI94L4/b2YkQSk64EiEFzvOXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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