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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a1e7479be3b2e263b1534fe5cdc43d4673c9b142a98a0375f47ac3a8b2a256ee' 
  AND token = 'QjUKUJuNqkbS1HM5zzKiJSuJi4euqrthrn5QH06KtjA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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