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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'accbaa7b372156e13e7bae86a54c4ed44eaec2e5c1b04c601b285fec7e9889aa' 
  AND token = 'wbJbBqMlLuAn2VTp0SW1V5SXmnvM6YSQ4TtCtgclIP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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