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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'efd58ba1bc251fd9b8e9cc9025a21cd69544b3193473fcde562a63a8c2258049' 
  AND token = '2V7Y7iw/bMkmE2QebVcwxhuz8clQJ/YEWsIU6yf6kWg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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