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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '05104d837545c4cf56a2c89a21ff5f337ff3617076c9e4fb8efbd43b21b8dcbd' 
  AND token = '2kPWbDw0SKf5LhpC7Vpp7yT1bhYbfDjhDYA8jz3H2VI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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