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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '939dc7db3dcc726edc5aaf8ec621e4dbbe44ba096bcd04e7aa2a8e200f173f41' 
  AND token = 'ycB/SxC2hEimb9hnr/9TfAGkPyut2evs0WKC3d6jeZw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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