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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '81ab7f0d51a374c7461ff17712d321a5da4dccce91f6dfe077101185e626a6bd' 
  AND token = '2N773wJNc3nT8iKjas2kez4dPO3gCi5vH9U31zdDf0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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