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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a17a80c678cc52ba5f0e30ab6a591f0c0c50fbf1ed4de02482171610bace9145' 
  AND token = 'eaAjZB9Kn1OwQXLVt12NLX+mbAaN19Rxgl3ZZlWMPVo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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