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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1acfa682737d0551bbf5de38fd05732607427d7d0841ad602fa3fb921a0e8acd' 
  AND token = 'mroT0RpNhjlzSxnWrp+WoKXo38bmOnRAa0krixJVDBc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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