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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8fb774b234875be1f0d272544e571756ca6469deca12b6f6e7ddbd1e7b2ddce6' 
  AND token = 'fHpjovRjKlJJi4ezDN+WHepCzpoNBfJf1WRo3dqiUSA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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