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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a1baa7e804e972c8bd43ba43db5cede368afa78e6d081d4256fd84950835e095' 
  AND token = 'YUtXrs2qJlAebPoRaUwRmqswkpE2NRhFjLhaFshF0nU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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