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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '93ef4d7047ee7fc9e3d8102a8f301c069af322e0429da6d0cb4aadb5a04fd8b4' 
  AND token = 'SWK0fPP4zYHm3LrXUJkXnd+Yj5qhYyOei3rgdxFRrT8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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