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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f64bac77dad1acea79ee1090f788cde3bd76a909a3fd56865c1fd98a70efd33a' 
  AND token = 'tsNOLVfG50EY4l22vUwHKKuD+0P3/XQ4rwPnER4ev4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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