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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c3c6fefc86a40782623f753b4274a3c1e5b29219c09c9d8dea079498c3346042' 
  AND token = 'zWXombuWyp98DmF98vfbNjMtwTsubHM/H/OSX17zowA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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