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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a99756d47808e9e5074757a8016406c3ed236247d64fcc2cbc51e9e2622ab076' 
  AND token = 'LiG3UepKH7vNpi7vSp2GpWmRuetFlHr9aJWDGv2tUdc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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