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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bd1e6289f88aa0a94c49428f102e02f2e65c793c2f1304df9e17b2600a6b60c3' 
  AND token = 'YGPdqkc8MQijxbedN/8fNO7AygoTcGqBIHtt5NMyILM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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