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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '717d759b2eb3ec649a88fd4e5d9debd715ff0e55697c72cd616a95464f6c0e03' 
  AND token = 'bZ1svg59W10bEtGvrTqkKCataY3A9M4yb14YMMNuXpA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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