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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd720a08b6f133ca82e38259b094df9c5b5c880b12c8ae8ce8fb341133f074dc4' 
  AND token = 'kkqourPeCKwQQ0CGH2p2NcW/eX1hfdeOrNVz3hzLqSM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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