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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '21f3b62fc1e9182aa69d3dabfdf1a46ea3a09d3a2a76b1494226b44efd889473' 
  AND token = 'befPL/Cif92azHWYHVuengN7DUHQmDRyQUPO9AEqhI4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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