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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '911aa52cf2edcf8ed27a268ce9028cbea39e39bf852a020c74724983c92fff25' 
  AND token = 'SeYNZFt8g8douVYLkFwW6xTQC0cFnNyPTmEleiUBLM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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