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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e4fa56205d630222808d1e9efb838075cedba9359fbd3c0c47968ff40fd46029' 
  AND token = 'c9l3tf+dTxKFxjWCy5ZTisFxlh72iDvtmx1T0vTZRzw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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