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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5ddd72ffd6f0e2ca90152cf1128ee3e1b8e04ebbf8be408a13802b997d2483f8' 
  AND token = '2mnGVT4iGoRjiMvn/CrADO/4of5GW9UkAYV6zrbaojI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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