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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2db2a84564bf9992535235c95e92700737f6f9fbd2d9842505d79bce3963805f' 
  AND token = 'a9zBhzx5qAFPIfus9V9K0lumhlRQdsIXFWcMefduWjQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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