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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e0383dfb80478a599e4878770e4ac27023219cd3dad01967563ff8568e79e5f7' 
  AND token = 'oozloofbzpIsqC6NTEAI5g/QqxmsuIoYd5FwvLtot5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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