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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '667480493c759021ce3a94e721eeaaef4b7f6ce92ae9f50a90144066ebb8f8d6' 
  AND token = '5DbLN+aDTwnq0bljq5U+TOyB8vAzyR4MVQiT5YoSGrE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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