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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4f3e084a5bf6d1eef9946f8e805769c56a774c4327654d19df03fbb7909dc57d' 
  AND token = 'HMIeiCS8o+ME9Eh9Xo3FzbNU/juKiNqik+issrS9YOA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00069

JSON explain

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