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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9971f6292e8bcbae93cc766a968f373c9586e13368f3c72fffbe6db001abab83' 
  AND token = '3zHjMyLLwurnSui3jABXfGxFGTuA2dgXxhUwrH6qqmE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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