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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5ca80005342ed8629c58550fcd25c952998e5af8ee1449a314949a01039ec294' 
  AND token = 'YTkmEzlbSnEDdyBzhb+74pIAEzBorBiDVyL3YwDePfQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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