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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '881ba191c481f7397a50d57c08bf1ded595684be50e1ceade21798d9902d0ad0' 
  AND token = 'AjTb2uDu3eZtC72uhA1Cma3LNhyGZyLHH/SzdRRiiTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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