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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1a2f1de4ba439eeb686989af63a86f75423c2478ebd9b09429556b9c4d60f5df' 
  AND token = 'JMJyNTaQQ0vYewyFt9xs2XD40LI0JHb3IwhY5hPsTho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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