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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '40fc112e26573fb50e756407c2418a434ed0e223af3e0d8f6a3b16d15117544c' 
  AND token = 'STxRQRlVwVxof5b/UXKdrdGhWpIqoJ6eSlyHjjx9ehQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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