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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '24f3de82c8779ea133d8a1abdc0816410b59c23855815a9a0ceb1176760094bd' 
  AND token = 'A13sWZ9yItI4cVCukKElVzuXu0SEFsW0f8Fd3PuIXm8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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