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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '50b4fb63dbe339ffaace36c4d39f26450e30f1335bac4561e5e239ff7dd6c4e6' 
  AND token = 'kfNxBcd7Sz6D5wuhlov936Fodv3r9gwAD0wWuiR4GHg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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