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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'adfdb76fc20733a2c5b7a36328de6f02e9ac349f27db798de662194cb8bde13e' 
  AND token = 'xRcxIQ1Sw8YQCG5pWxGukEczOnedFUcnSxEQRWvrM7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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