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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5889cd6abf1590cb76a9bedab57a1e22a23332c967c388e2a079c81fbfcd8a0d' 
  AND token = 'FmbWGOnNJvMYzuBsx2Q5ZbbEEyfXGEi+TSNvY1QxnXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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