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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3540a9cc2313f29103009d81f053958217eec0a42385a09e6f2d955613ca11b4' 
  AND token = '8EmLrCUIV3WPlMxtbKVWt24ws8AKc5lOt6nySV9Xxdk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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