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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e68384fbca51221f9b50bc730d31b572cf0f0114e26b6c1544fee0241d9644a1' 
  AND token = 'NVsrTIN4WlgiizaK+RMOgbPeKXf3AY+Yorw+bLTFmjw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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