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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'deb396fba13bd3913d59a53e892da62eed4216a57d8ef1d404719207722332dd' 
  AND token = 'xWqPbav3yvSk9KGXD9HQ+n/ebd6a0mDs+hARqB7ZPRQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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