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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '730bb2204142919dd909f86da5a9d5a9e8078fe1dab3ec85605c4cb769188152' 
  AND token = '4ng8b8pe+LG9zLiXOwai7cLW23rsCIQYGtc1fQ7j0i8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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