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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5925ebd07a6833337de12ac6c72689d8792afd5a3c56c0d24ebabb47ead3f0d5' 
  AND token = 'aJNpFkGOC0nOfnvwRv3NvhOpnNmD3fh6mKo/e9mm33w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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