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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c420d228c518a37bf85c187dfbab8ed8f8a7df07cfced53da740158667d6a8ec' 
  AND token = 'o6v+UBrPqnF9dL92C2z8izE2F9TR8CldiJTnyzmMmUA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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