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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e1fa8dbe00de082a55579a01ef77443266449b52a2b95f74421024228091258a' 
  AND token = 'HuKxqavbonUY/7srTxm4EKp9WPGvJ0qt1ogkVNDK+2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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