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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd4c80ee1de702e9f7e94446049cc42f1e497795a398cb09fc0c6a0ccf6a880bf' 
  AND token = 'HUiBacXYh19xdsRbxcVddwVH/NjU2gmjjMZMWgw8s/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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