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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5c710fbdb302bd0beafdf2b9efa201e097751f86c1a508c5ebe2799a7fda7e59' 
  AND token = 'CmCoJ4t9Rr2wg2pNWIISgqlGfgWr2DmzJj5mSap666o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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