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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e3cbc865b9bdef536c770b20838547dcd1f4323e99ea674d44b1a3ff85b7aaa1' 
  AND token = 'UxyERWmIP12uyMnzJCdlAZmXlByAJF30TNgPEbAVYH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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