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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd1cdf7e35b98339deaa4124163e0d140f50d1d48aa1218e3ea25180331e6ca81' 
  AND token = 'NSfl5N06UzucsIisCeWLmCUQ1p9LjG4ExNkiIfMcUyE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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