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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5e687292a237a393d5b4e296c0fbe4a8dee0d6aeeb41d05f359544d1ae761ab5' 
  AND token = 'ygM2TTe7xLFB13BSUTZ6m+3Vn+YPXzjcikj5cOaLv78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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