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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '897b0c9a3c63b7f3c65f6880e9fb0249b2d088d8d00e9d15a037e8c6d7905615' 
  AND token = 'Wyi9lAquzs6tIfqk9t4ndTVGBr/kIxO6W9dc21oqUYs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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