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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cd52ecb62a47c6b8e2a6525ebdd84a806a7030cda288814774a24b6c4a9e5d13' 
  AND token = 'gLHWuRJCEYXboplYevd3pJ49LlEJehQvaPu/4MoXmcA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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